For SMS send to mobile i used below code, but its not working pls any one help me

protected void Button1_Click(object sender, EventArgs e)
    {
  
        UriBuilder urlBuilder = new UriBuilder();
        urlBuilder.Host = "127.0.0.1";
        urlBuilder.Port = 8800;

         
        string PhoneNumber = "09638136263";
        string message = "Just a simple text";

        urlBuilder.Query = string.Format("PhoneNumber=%2B" + PhoneNumber + "&Text=" + message);

        HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(urlBuilder.ToString(), true));
        HttpWebResponse httpResponse = (HttpWebResponse)(httpReq.GetResponse());

       Response.Write(httpResponse.StatusCode.ToString());
        Response.Write("sms send successfully"); 

}